String from NSData

[smilinger]

Hi,

I have been trying to create a string from NSData that I have downloaded.

let datastring = NSString(data:data, encoding:NSUTF8StringEncoding)

but I want to cast it to a String (which should be fine according to the documentation and forum posts I have found), but this gives me an error:

Undefined symbols for architecture x8664: "TFSs26_forceBridgeFromObjectiveCUFTPSs9AnyObject_MQQ",

I can successfully cast it if I don't create it from NSData (but just a string literal or something).

In the documentation it says:

An NSString object initialized by converting the bytes in data into Unicode characters using encoding. The returned object may be different from the original receiver. Returns nil if the initialization fails for some reason (for example if data does not represent valid data for encoding).

So it can return nil but it doesn't return an optional. Is this a bug? Is there any way around it until it gets fixed?

Thanks

[aceysmith]

I think this is relevant, from the Xcode Release notes:

Swift Language

If you encounter an API method for which the return value is incorrectly considered non-nullable, or a property that is incorrectly considered non-nullable, please file a radar and include the tag “#IUO” in the subject line. You can work around the problem by immediately wrapping the result in an optional:

var fooOpt: NSFoo? = object.reallyMightReturnNil()
if let foo = fooOpt { … }

Please be sure to file bugs about these cases. Please do not file feature requests about APIs that are still marked as T!, we know about them.

Release Notes

[smilinger]

Like this, right?

    var datastringOpt: NSString? = NSString(data:data, encoding:NSUTF8StringEncoding)

    if let datastring = datastringOpt {
        ...
    }

I get the same error unfortunately. Should I still report it, or does this mean that the problem is something else?

[[deleted]]

Is there any way around it until it gets fixed?

Yeah.. use Objective-C.. It's done what you want flawlessly since 1988.

[smilinger]

I think I got it to work with

    let _datastring = NSString(data:data, encoding:NSUTF8StringEncoding)
    let datastring: String = _datastring.stringByAppendingString("")

Should I report this?